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Research on mechanism of springback control by viscous medium with different mechanical properties
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NSTL
Elsevier
Viscous pressure forming has shown its advantages in precision forming of complex surface components. However, there are very few reports focusing on revealing the mechanism of springback control by viscous medium. This paper aims to study the effect of viscous medium on springback and the mechanism of springback control by viscous medium. The viscous pressure forming of a bulging axisymmetric geometry is studied. The effect of viscous medium on springback and stress path of sheet is analyzed in numerical simulation by unloading the sheet and viscous medium together. Then, the experiments are conducted using different kinds of viscous medium and loading speeds. The digital correlation image (DIC) technology is employed to measure the springback. The stress and membrane force of the bulging sheet are calculated and analyzed. Results show that non-uniformly distributed force of viscous medium changes the shape and stress path of the sheet. The viscous medium simultaneously possessing good strain rate sensitivity and viscosity can well control the springback. This is because the coupling effect of non-uniform normal force and tangential adhesion promotes the uniformity of stress distribution on the whole sheet and reduces the bending moment of sheet near the die corner.
Non-uniform normal forceSpringbackStress pathTangential adhesionUniform stress
Feng Y.-K.、Wang Z.-Y.、Wang Z.-J.、Shi S.-G.
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National Key Laboratory for Precision Heat Processing of Metals School of Materials Science and Engineering Harbin Institute of Technology
Hunan Aviation Power Research Institute Aero Engine Corporation of China
NSTL
Elsevier
